Posts by War Puppy 10 publicly visible posts • joined 24 Feb 2014
I was given a ZX81 as pay for my 1st ever dev job that was developed on my ZX80 (paid for through much wrinkled skin, car washing my weekends away).
Basically my dad was a Quantity Surveyor, barely using a calculator (up from slide rule) and I wrote some code to work up costing for a building after inputting some basic data. From an hour down to 10 minutes.
We went into his work, where slack jawed Neanderthals witnessed the future as I priced up a drawing in 10 minutes, that their best took 40 minutes over.
I do miss the days of wonder, as 'new tech' appeared weekly or monthly in magazines, I had to travel on a 1 hour bus to buy.
Same PNG resized for testing ( 500,1000,2000 px), normal JPG compression too fast to worry over. Skylake 6700. Set at quality 90.
As you scale up, the time to compress gets 'entertaining'. Can see where Ryzen cores/threads will be useful if I want to do my 18,000 images. The 2000px one throws up an oddity. Needs more work.
1.2M test-1000.png
5.0M test-2000.png
292K test-500.png
----
200K c-1000.jpg
1000K c-2000.jpg
56K c-500.jpg
---
168K g-1000.jpg
1.1M g-2000.jpg
40K g-500.jpg
500 ======================
real 0m7.588s
user 0m7.270s
sys 0m0.317s
1000 ======================
real 0m46.546s
user 0m44.248s
sys 0m2.291s
2000 ======================
real 5m4.220s
user 4m51.535s
sys 0m12.659s
In the early 1900s a fifth of all ships in the world were made on the River Clyde in Glasgow. Chatham? Wassat - another little England rant.
"British governments stopped subsidizing the ever ungrateful Scots" - elReg loves a stupid statement. Another little England special. The Scots have been subsidizing England while also being 'British' eh!
Can't wait to leave England to its tinpot navy and teeny tiny world presence/reputation. Yup - Scotland should leave us dumb Wanglanders to the mess we've created.
HEVC is simply more efficient than H264, which was more efficient than MPEG2 .. and so on.
There are not 4x as many pixels unless you are dealing with a stream that has 4x as many pixels!!!
For example:
SD in MPEG2 is 4 Gigs of data. 2 hour movie
SD in H264 is 1.5 Gigs for the same quality.
SD in HEVC is 0.8 Gigs for the same quality.
The transmission rates for HEVC broadcast will save a lot of bandwidth, as would transmitting current MPEG2 SD streams in H264.
So getting HEVC (H265) into a new 'FreeviewSHD' box, and changing all transmissions to H265 would provide plenty of scope for more crap SD channels, or a few 4k channels on top of what there now due to the compression savings across everything else.
HEVC is needed to cope with 4k pixels because data streams would be huge under H264, using up valuable bandwidth.
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